The doping mechanism of Zn<sup>2+</sup> promoting the polymorphic transition of TiO<sub>2</sub> during calcination

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Abstract High temperature calcination is an important stage in the production of titanium dioxide by sulfuric acid method. Zinc salt treatment can reduce the temperature of polymorphic transition. But the internal mechanism is still unclear. Using metatitanic acid and zinc sulfate as raw materials and salt treatment agents, the calcination is performed in a muffle furnace at 600 to 900 ℃. The effect of Zn²⁺ on polymorphic transition and doping mechanism were discussed by XRD, HRTEM and XPS. The results show that the concentration of Zn²⁺ and the calcination temperature significantly affect the doping mechanism and existence state of Zn²⁺ in the polymorphic transition. When the concentration of Zn²⁺ is less than 1%, Zn²⁺ is incorporated into the TiO₂ lattice in substitution mode, replacing Ti⁴⁺, increasing the cell parameters and forming oxygen vacancies. And with the increase of Zn²⁺ concentration, excessive Zn²⁺ forms ZnTiO₃ on the surface of TiO₂. Substitutional doping and ZnTiO₃ can reduce the phase transition temperature and promote polymorphic transition from anatase to rutile through different doping mechanisms.

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	WANG Wei
	LU Ruifang
	WANG Chenguang
	DANG Leping
	HAO Lin
	WEI Hongyuan

Keywords： polymorphic transition Zn²⁺ ions substitution doping ZnTiO₃

Received 2022-02-17;

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WANG Wei, LU Ruifang, WANG Chenguang, DANG Leping, HAO Lin, WEI Hongyuan.The doping mechanism of Zn²⁺ promoting the polymorphic transition of TiO₂ during calcination[J] Chemcial Industry and Engineering, 2024,V41(4): 55-64

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